Credit scores explained: what actually moves the number

Your credit score is a three-digit number (300 to 850 in the FICO model) that lenders use to predict how likely you are to pay back debt. Higher = lower risk = better rates. A 50-point difference can mean tens of thousands of dollars over the life of a mortgage.

A score is a price, not a grade

It is easy to read a credit score like a report card, where 800 is an A and 620 is a D. That is not what lenders do with it. They sort applicants into bands, and each band carries its own interest rate. Moving up a band does not earn you praise, it changes the price you get quoted on a mortgage, a car loan, or a refinance. That is the practical meaning of the number: it is a price tag on money you have not borrowed yet. And because a rate applies to every payment across the entire term of a loan, a gap that looks small stated as a percentage keeps costing you for as long as the loan runs.

What actually moves the score

• Payment history (35%): paying every bill on time, every month. Single biggest factor.
• Credit utilization (30%): how much of your available credit you're using. Keep below 30%, ideally below 10%.
• Length of credit history (15%): older accounts help. Don't close your oldest credit card.
• Credit mix (10%): having different types (cards, loans) helps slightly.
• New credit (10%): opening many accounts quickly hurts temporarily.

Common myths

• Checking your own credit hurts your score: false. That's a 'soft pull' and has zero impact.
• Carrying a small balance helps your score: false. Pay it off in full every month.
• Income affects your credit score: false. Lenders see income separately, but it's not in the FICO formula.
• Closing credit cards helps: usually false. Closing reduces your available credit, hurting utilization.

What this lesson is NOT

This lesson covers what actually moves your score and the common myths that do not, like the idea that checking your own score hurts it or that carrying a balance helps. It is not a credit-repair pitch and not a promise of a specific score by a specific date.